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प्रश्न
Tick the most appropriate answer.
Physical changes are
पर्याय
permanent
periodic
temporary
irreversible
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उत्तर
temporary
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Boiling of water to form steam.
Melting of solid (wax) is a physical change.
What do you observe when :
lighted match stick is brought near the mouth of the test tube containing hydrogen gas.
Name two reversible changes.
Classify the following as a physical or a chemical change.
Drying of wet clothes
Fill in the blank.
The reaction in which energy is evolved is called
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
Select the correct answer from the choice given below to complete the sentence
A change in which a substance retains its identity is a
______ change.
State whether the following statement is true or false:
Anaerobic bacteria digest animal waste and produce biogas.
Give two examples for the following case:
Physical changes which are reversible
